Limit of a function

1. The problem statement, all variables and given/known data
http://www4b.wolframalpha.com/Calculate/MSP/MSP10351a01a355263db6f2000030459ebe888feb73?MSPStoreType=image/gif&s=10&w=131&h=41 [Broken]
I know the answer, but I don't know how to get it.

If this is the equation, the limit does not exist, the answer should be DNE! The way you do it is basically plug in 1 and then you will get 0 on the top and basically it won't exist.

This function definitely HAS a limit as x approaches 1. Just because it evaluates as 0/0 does not necessarily mean the limit does not exist. Instead, you can use other methods like multiplying by a conjugate, factoring, L'Hôpital's Rule, etc.

with that being said, you could use L'Hôpital's Rule, but I'd recommend multiplying by the conjugate as sheriff89 said.